[GRASSLIST:5930] Multiple coordinate systems

[John Harrop]

Hi,

I've not been able to come up with a comfortable way of handling 
projects with multiple coordinate systems in grass.  Perhaps I'm missing 
something...

Our typical project uses at least two coordinate systems.  One is a 
local coordinate system oriented by data collection methods and used for 
processing of such data.  The second is usually a UTM projection and 
most final maps are produced in this projection.  The relationship 
between the two is a simple shift and rotate operation since the areas 
we are working with are quite small.

I can see how to transform one mapset while importing into another 
mapset, but after that is done you obviously have a potential map 
version conflict when one but not the other is updated with new data.

Is there a way to overlay different projections and/or non-earth 
coordinate systems in grass on-the-fly?  (Similar to how MapInfo and 
other systems handle it.)

Any comments folks?

Thanks,

John Harrop